Extensive combined experimental and theoretical investigations of the linear evolution of three-dimensional (3D) Tollmien-Schlichting (TS) instability modes of 3D boundary layers developing on a swept airfoil section have been carried out. The flow under consideration is the boundary layer over an airfoil at 35° sweep and an angle of attack of +1.5°. At these conditions, TS instability is found to be the predominant one. Perturbations with different frequencies and spanwise wavenumbers are generated in a controlled way using a row of elastic membranes. All experimental results are deeply processed and compared with results of calculations based on theoretical approaches. Very good quantitative agreement of all measured and calculated stability characteristics of swept-wing boundary layers is achieved.
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November 2019
Research Article|
November 18 2019
Experimental and theoretical study of swept-wing boundary-layer instabilities. Three-dimensional Tollmien-Schlichting instability
V. I. Borodulin
;
V. I. Borodulin
1
Khristianovich Institute of Theoretical and Applied Mechanics
, Novosibirsk 630090, Russian Federation
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A. V. Ivanov;
A. V. Ivanov
1
Khristianovich Institute of Theoretical and Applied Mechanics
, Novosibirsk 630090, Russian Federation
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Y. S. Kachanov
;
Y. S. Kachanov
1
Khristianovich Institute of Theoretical and Applied Mechanics
, Novosibirsk 630090, Russian Federation
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D. A. Mischenko;
D. A. Mischenko
1
Khristianovich Institute of Theoretical and Applied Mechanics
, Novosibirsk 630090, Russian Federation
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R. Örlü
;
R. Örlü
2
KTH Royal Institute of Technology, Linné FLOW Centre, Department of Mechanics
, SE-100 44 Stockholm, Sweden
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A. Hanifi;
A. Hanifi
2
KTH Royal Institute of Technology, Linné FLOW Centre, Department of Mechanics
, SE-100 44 Stockholm, Sweden
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S. Hein
S. Hein
3
Institute of Aerodynamics and Flow Technology, DLR
, 37073 Göttingen, Germany
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Physics of Fluids 31, 114104 (2019)
Article history
Received:
August 28 2019
Accepted:
October 23 2019
Citation
V. I. Borodulin, A. V. Ivanov, Y. S. Kachanov, D. A. Mischenko, R. Örlü, A. Hanifi, S. Hein; Experimental and theoretical study of swept-wing boundary-layer instabilities. Three-dimensional Tollmien-Schlichting instability. Physics of Fluids 1 November 2019; 31 (11): 114104. https://doi.org/10.1063/1.5125812
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